Tolerance to salt stress in soursop seedlings under different methods of H2O2 application

Abstract

The aim of this study was to evaluate the effect of different methods of hydrogen peroxide application on biomass production and quality in soursop seedlings under salt stress. The study was conducted in a greenhouse, in a Psammitic Regolithic Neosol of a sandy-loam texture. The treatments were distributed in a completely randomised design, in a 5 x 4 factorial scheme, with five levels of electrical conductivity for the irrigation water -ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m -1 ) and four methods of hydrogen peroxide application (Control, application by soaking the seeds, application by spraying, and application by soaking and spraying), with two plants per plot and four replications. From 0.6 dS m -1 , the salinity of the irrigation water inhibited dry matter production and altered the leaf morpho-physiological index of the soursop seedlings 145 days after sowing. The method of hydrogen peroxide application by soaking the seeds minimised the effect of salt stress on root dry matter production and the quality of the soursop seedlings, and increased leaf succulence, standing out as a tolerance mechanism to salt stress. The application of hydrogen peroxide by soaking the seeds favoured an increase in the root to shoot ratio in soursop exposed to salinity of the irrigation water.

Production and Fiber Characteristics of Colored Cotton Cultivares under Salt Stress and H2O2

“…Foliar application with the highest concentration of H 2 O 2 (75 µM) resulted in increased seed cotton weight (SCW), lint cotton weight (LCW), and resistance of the fiber to rupture (STR) in 'BRS Topázio' cotton when irrigated with low-salinity water (0.8 dS m −1 ). Generally, satisfactory results are not observed with the application of high concentrations of H 2 O 2 in plants that are not under some type of stress [23,24], which was not found in the present study for the variables LSW, LW and STR. It is probable that this result is related to the time interval without H 2 O 2 application to which the plant was subjected, considering that the last application was performed before the opening of the boll of the first plant; that is, a period of approximately 50 days without the application of H 2 O 2 .…”

Peróxido de hidrogênio na indução de tolerância de mudas de goiabeira ao estresse salino

“…The treatments consisted of a 5 × 4 factorial arrangement, combining five levels of electrical conductivity in the water (ECw: 0.3,1.3,2.3,3.3,and 4.3 dS m -1 ), based on the study by Bezerra et al (2018), and four concentrations of hydrogen peroxide (H 2 O 2 : 0, 25, 50, and 75 μM), based on the work by A. A. R. da Silva et al (2021). The experiment included four replications, with two plants per plot.…”

“…In addition, it provides a decrease in the absorption of water and toxic ions that would result in damage to essential biochemical processes (A. A. R. da Silva et al, 2021).…”

Salinização secundária no semiárido e seus impactos no solo, na agricultura e cultivo das plantas – uma revisão

“…A cultura da graviola tem se mostrado de grande importância socioeconômica no mercado nacional, seja pela geração de emprego e fixação de mão-de-obra no campo e até mesmo pela destinação da produção tanto para consumo in natura quanto para a utilização pela agroindústria (Oliveira Neto et al, 2014;São José et al, 2014), no entanto a limitação quantitativa e qualitativa dos recursos hídricos da região Nordeste do Brasil tem reduzido sua produção. Para Silva et al (2021a) as pesquisas que abordam o uso de água salgada na agricultura têm se tornado cada vez mais importantes no sentido de garantir o desenvolvimento sustentável das lavouras Silva et al (2018) ao avaliarem os efeitos da irrigação com água salina com CE 0,5; 1,1; 2,5 e 3,5 dS m -1 sobre o crescimento e trocas gasosas de gravioleira adubada com diferentes fontes de nitrogênio, reportaram que a ação isolada do nitrogênio bem como sua interação com a salinidade não influenciou o crescimento nem as trocas gasosas das plantas. Os autores confirmam ainda que com o aumento da salinidade da água a partir de 0,5 dS m -1 inibiu a abertura estomática e a carboxilação nas folhas.…”